Introduction to the latest application technology

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New application technology introduction: electromagnetic printing (I)

electromagnetic printing is the main application technology of nipson printing machine, which was invented by bull company in 1980 and commercialized in 1984. This printing technology consists of an array of small electromagnetic recording heads, which produce a magnetic latent image on the surface of the hard metal drum, and then develop it through magnetic toner. The toner adsorbs ink on the magnetic latent image, which is transferred to the paper under pressure, and then heated and fixed to form a fixed image. This printing technology is a new application technology for the printing industry

In order to prevent the migration and dissolution of toxic and harmful chemical pollutants remaining in the material

first, the printing engine

the printing engine is composed of several simple and reliable subsystems. The basic body of the engine is the drum, which is made of hard metal, which is very similar to the application of photocopying Technology. The other subsystem is similar to other non-contact technologies in function, but its structure is actually very different. The surface structure of the printing cylinder is an electromagnetic hard layer, which is placed on a magnetic soft material, and the magnetic intensity is about 500 oerst

in fact, the mechanical resistance of the roller surface is quite strong, without the use of soft coating, and the life of the roller is more than 15million feet long.

electromagnetic printing can match different image lengths to meet the needs of printing applications, without changing the roller diameter, just increase the speed of the printing engine

the magnetic residual image on the drum can be demagnetized by the elimination rod every time it rotates, so that the drum can continue to receive new magnetic images

II. Recording head

the image recording station contains a set of array electromagnetic recording heads, which are axially parallel to the drum. Its processing process is similar to that of the recording head of the disk drive in the computer, but it is specially designed for the application of electromagnetic printing. The first generation recording head used in the early stage is used for vertical recording, and the coil will not continue to change during operation. In this way, the lower driving current can be used, which is about 100 - 15. Don't put the problems you don't understand in the range of 0 μ a, which can produce higher magnetic efficiency and higher transverse density. It is impossible to use the traditional recording structure. The density of this recording head is 240 poles per inch to form 336 poles per square. The development of Electronics makes the recording head of the second generation electromagnetic printer better, that is, in order to exceed the 240dpi currently used, we must consider the use of collective recording components, combined with standard silicon microelectronics and silicon electrochemical precipitation, to make it possible to integrate magnetic and electromagnetic microstructures. The electromagnetic silicon recording head contains an inch square silicon chip. This recording head is a high-density array recording electromagnetic, which is located by the diode matrix on the chip. This new recording head can obtain a recording head with higher printing quality, better stability and higher speed

the function of the electromagnetic recording head is similar to the imaging effect of the reflected beam in the laser copier, the LED in the electron photography, or the ion clamped in the electron beam

III. latent image and imaging

the recording head writes a magnetic point on the surface of the drum after opening, and each magnetic point forms a permanent magnetic field to form a latent image. The external magnetic field around the image on the surface of the drum is very low (the maximum is about 100 to 200 oersted). However, the magnetic field shows a particularly high sharpness, which is an important factor due to the use of carbon powder imaging

The main advantage of electromagnetic printing is the permanence of images. When the image is generated, many copies can be printed without re recording. In fact, once recorded on the drum, it can be maintained for a long time as there is no magnetic interference. This feature is different from other non-contact printing technologies. As a new type of building energy-saving glass material, it is bound to play a great role. When the roller rotates through the developing station, the fine particles of a single group of toner will be adsorbed on the magnetic image, which can reduce many problems of the traditional two-group color amplifier if the output voltage is unstable. If it is necessary to monitor the concentration of toner added to the stretcher at any time. In fact, in the past, it was used to eliminate the problem of single group of toner by using a vacuum knife or trimming pinholes to remove it after image development, so that excess toner can be removed and a sharper image can be formed

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